Diestock



March so 1926-.' 1,578,991v J. HlRsr v DIEsTo-GK Filed Feb. 19, 1924 lllllllllllllllll IIIL WMZMW/ Patented Mar'. 3o, 1926.

anilrns'mnsr, or mannose, MAssAcHusnrrs. 'y

. DIESTOCK.

Application filed February 19, 1924. Serial No.' 693,883. l

Toy all whom t may concern: j

Be it vknown that I., JAMES Hins'r, a citizen of the United States, residing at Mel-- -1ose, in' they county of Middlesex and State of Massachusetts, have invented new, and` useful Improvements in Diestocks, of which the following 1s. a speciiicatio'n. i Y

This invention relates to a tool including i "fa stock or holder adapted to securely coniine and operate al pair. of dies formed to cut male screw threads on a rod or bolt, and to .permit the quick and convenient application vand removalof the dies and the substitution of others therefor, as set forth in inyLetterf Patent of the United States, No. .1,484,067 dated February A19,:k 1924. y The invention isembodied in certain im rovements whichV I will now roceed to de v yf`f'*'scribe and claim, on 'the tool disclosed by -said application.

Of the yaccompanying drawings forming a part of this specification,'-

Figure 1 is a perspective View of the stock for holder, the dies, the die-securing tongues,

and the handles being removed.'

Figure 2 1s alongitudinal section ofthe entiretool, the handles being broken away. y

Figure 3 is a side view, showing a! work l guide engaged with the Atool body.

Figure 4 is a section onY line 4 -4 of Figure 3.

The same reference characters indicate-the same parts in all of the igures.'

The body ofthe stock orfholder is composed of duplicate side portions 12,12, and end'po'rtionsl' and 14, said portions bounding an opening 15, adapted to receive a. pair of dies 16. The'dies have the usual acting l' portions V17,- adapted to out male screw threads on al bolt or rod. The sideportions:

12 are 'provided with .slots 19, communicab ing with the'opening 15, said slots havin-g extensions '191l extending through the end portion 14, and along the periphery of a boss 20, formed on said end portion;

Connected by pivots 2l with the side portions 12, at one end of theholder, are two die-engaging ,bars orV tongues .22, v. having their free ends reduced in width and provided with ears 23, adapted to enter the portions of the slot extensions 19a thatlare formed in the boss 20. The dies 16 are provided, in opposite edges, with grooves 24 which receive the inner edges of the tongues 22, when the tongues are in theiroperative positions. l

`. their sidewise removal.

The engagement 'of thetongueswith the," "f v `die grooves con'iines thejdies against sidewise displacement,l and permits endwisof movement ofthe'dies' in'the opening 15.

The tongues 22 arereleasably vconfined.

a tubular flange v26, formed onra'- handle 27..v

Said handle yis` provided .with .af screw-` l Y threaded shank 28, engaged: with *a Vtapped orifice in the boss 20-, The `ears y23' are flush coy with thel boss20, when the-tonguesl arey in their operativepositions, and the. arrangement is such that when v the shank' v28 is" screwed inward, the flange 26 j simultaneously loverlapsand engages theears 23, and

constitutesa keeper confining thetongues in engagement with the dies.. When the shank: f' i 28 screwed outward, the keeper. simulta-l neouslyk releases',l the ears 23, so that'the'jVV 0.,.

tongues may befswung outward andlthus displaced, jto. 'release thevdies and-permit When thetool is in use, .oneiof the therefrom by a rod or bolt tobe threaded, in-

'against the abutted die as shown, or spaced.

. dies 16.` Y' vis'abutted .against one end .oftheopening-SG terposed between the dies, wh'enfthe diam- .f

f eter of the rod is such that the diesfdo not meet. The shank 30 engages a tapped orin fice in the endr portionv 13, and is yprovided with a handle 29. Said handle has a tubular iiange 32, embracing andslidabl'e on la tubular boss 31, formed on the end portionv 13.

VThe diefconiining shank 30 is fixed to `the handlef29` and is longitudinally .adjustable by' rotation of said handle, to adjustably.,

confine the die 16 with whichit. contacts. The handle 29 and the companion handle 27alinedtherewith, are Vgrasped .bythe screwthread.

my Patent No. 1,484,067.

Ahands of the operator, as usual', whenthe stock is being turnedgor revolved to cut a' The die'16, shown at the [left in Figure 2, and seated on one end of the opening 15, is

non-adjustable, the other die is movable in the opening toward and from the non-- adjustable die, and as'before stated, may be' held by the screw-.threaded shank 30, either against the non-adjustable die, i or spaced therefrom by a rod orboltltobe threaded,

interposed between the dies,`when.the diam'V -eter of the rod is such that vthe ydies Adol not meet.

The structure thus far described that ot ,1.100

gageinent with a opening 15'.

graduated scale35, cooperating with an an When the dies do not'ineet and are spaced apart by the rod, the spacing of the dies determines the diameterl of the thread cut onthe rod, I 'provide indicating rneansor determining the spacing required to produce a thread of a given diameter, and locking means for securing the shank 30 in any adjusted position, and thereby maintaining any predetermined spacing of the dies. The locking ineans isv'einbodied in a lock-nut 33, engaged *with theithread of the shank 30, and adapted tobe set up .into binding entace Sil on the end portion 13, thus preventing rotative adjustment of the shank BO v.and handle 29. Vr lfhe ace- 34C ina-y be the bottoni of' recess formed in the end portion 13, and communicating with the The lock-nut 33 is preferably circular, and has a milled or knurled periph'- ery, adapted to" be engaged and turned by av thumb Vand tinger. n

Theindicating means! is embodiedin a nular scale Sti-(Figure on the. end of the tubular vlange'BQ, to indicate the necessary adjustment ottlie shank 'tor a given thread diameter.

It Willfnowtbe Vseen that l enabledftoV`v accurately :adj ust the ustable die, to,r produce a thread ot a predeterminedl diameter, by suitably "rotating the shank 30, and to niaintainthe shanlrin any adjusted position,

and thereby maintain any predetermined spacing ot the die, this being accomplished before the stock is applied to a. rod Vto be threaded. By forming the thread when the dies `are spaced apart, l ain enabled to sub-V sequently decreasethe size of the thread, it

this is found desirable, by again decreasing the spacebetw'een thev dies. f Y v The rod to he threaded is usually held in va vise during Athe'threading operation, the

'endo't the'rod tobe threaded being uppermost. The' aggregate vlength ofthe stock including the. handles, is such that unless great careis.ezxercised'by the operator, the sto'clc is liable to be tipped or inclined niore or`less-, relativetothe axis ot the rod` the latter being, asaboue stated, tixedly held ask by'a vise. @To prevent this liability I provide a crossbar 38, slidably e'ngagedby ears 39, onv its opposite ends, with the oppowith a recess ing anexternally threaded portion, engaged with a tapped orihce in the cross-bar. The

bushing may be used interchangeably with other bushings having openings 40' of dii- `ferent sizes. The cross-bar is '.torined to vbe slippedr on to either end ot' the body, and to slide thereon toits operative position, fthe inner sider of 5LB, enabling the cross-bar to be inoyed across either ot the enlarged or thickened ends 13 and 14 of the. body.

The axis on which the stock is turned isa point equi=distant troni the acting'` portions ot the dies 16, and .is therefore, variable and deterininet by 'the adjustment of the `ad-l means permitting relative'` adjustment of the dies to ,vary the Width of the space between them, and a tubular guide for the article being threadedvsupported `on the body and projecting laterally 'from one tace thereof, the bore of said guide including a section, eX- tending outward 'from the end adjacent the dies and having throughout its length a uniorin diameter corresponding1 to that of the Y article to be threaded, providing` means for engaging a' considerable length ot said article and preventing any tipping or lateral increment thereof relative to the dies, Vtor insuring properfstarting of the thread, the

guide beine" movable longitudinally ofthe-- body out or alignment with thee-pace sepa-Y ratingthe dies, whereby 1t may .be positioned so as not to interterewth cutting athread `throughout ,the lengthl ot a boltor rodv L in testimony whereof I have Vatiixed my JAMES inner, f

signature.-

the cross-bar being provided. 

